/* 容器居中 */ 
.container {
    background-color: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    text-align: center;
    margin-left: 500px;
    width: 90%;
    max-width: 400px;
    align-items: center;
    }
    
    /* 二维码部分 */
    .qr-code {
    align-items: center;
    margin-bottom: 20px;
    display: flex; 
    flex-direction: column; 
    align-items: center; 
    justify-content: center; 
    }
    
    /* 欢迎文字和服务描述 */
    .welcome-text {
     font-size: 18px;
     font-weight: bold;
     color: #333;
     margin-bottom: 10px;
    }
    
    .service-text {
    font-size: 16px;
    color: #555;
    margin-bottom: 20px;
    }
    
    /* 二维码图像 */
    .qr-image {
    width: 200px;
    height: 200px;
    margin-bottom: 20px;
    }
    
    /* 按钮样式 */
    .scan-button {
     background-color: #4CAF50;
     color: white;
     padding: 12px 30px;
     font-size: 18px;
     text-decoration: none;
     border: none;
     border-radius: 5px;
     cursor: pointer;
     transition: background-color 0.3s ease;
    }
    
    /* 按钮悬停效果 */
    .scan-button:hover {
     background-color: #45a049;
    }